{"instruction": "You are an expert in event extraction. Please extract events from the input that conform to the schema definition. Return an empty list for events that do not exist, and return NAN for arguments that do not exist. If an argument has multiple values, please return a list. Respond in the format of a JSON string.", "schema": [{"event_type": "adverse event", "trigger": true, "arguments": ["Treatment.Dosage", "Subject.Age", "Subject", "Subject.Population", "Subject.Race", "Combination.Drug", "Subject.Disorder", "Treatment", "Treatment.Duration", "Treatment.Disorder", "Subject.Gender", "Treatment.Drug", "Effect", "Treatment.Freq", "Treatment.Route", "Treatment.Time_elapsed"]}, {"event_type": "potential therapeutic event", "trigger": true, "arguments": ["Subject.Race", "Subject.Disorder", "Subject.Population", "Treatment", "Treatment.Route", "Effect", "Subject", "Treatment.Duration", "Treatment.Freq", "Treatment.Disorder", "Subject.Gender", "Treatment.Time_elapsed", "Treatment.Drug"]}], "input": "BACKGROUND: To assess the nature, incidence, and risk factors of retinopathy associated with pegylated interferon and ribavirin combination therapy in chronic hepatitis C patients."}
{"adverse event": [{"trigger": "associated ", "arguments": {"Treatment.Dosage": "NAN", "Subject.Age": "NAN", "Subject": "chronic hepatitis C patients", "Subject.Population": "NAN", "Subject.Race": "NAN", "Combination.Drug": ["pegylated interferon", "ribavirin"], "Subject.Disorder": "NAN", "Treatment": "pegylated interferon and ribavirin combination therapy", "Treatment.Duration": "NAN", "Treatment.Disorder": "chronic hepatitis C", "Subject.Gender": "NAN", "Treatment.Drug": ["pegylated interferon", "ribavirin"], "Effect": "retinopathy", "Treatment.Freq": "NAN", "Treatment.Route": "NAN", "Treatment.Time_elapsed": "NAN"}}], "potential therapeutic event": []}